TWI652101B - Scrubbiing tower type solvent recovery device and method thereof - Google Patents

Abstract

The utility model relates to a device and a method for solvent recovery. The solvent is washed in a washing tower, which is provided with a corresponding washing liquid in a closed washing tower, and then the gas enters into a gas-liquid phase washing and adsorbing structure for The gas entering the washing tower is mixed into the washing liquid of the tower body and the water to produce mutual mutual absorption, the drug washing strengthens the concentrated adsorption, and the adsorption solvent is washed by the mixed washing liquid. Step 1: The organic substance is washed and adsorbed by the oil or the liquidified adsorbent in the washing liquid washing adsorption zone or the liquid substance washing or adsorbing which has the phase change state separation or the freezing point metamorphosis separation; or the second step: the washing liquid regeneration in the washing liquid regeneration desorption zone a material, which is desorbed as a regenerated oil, a solvent or a step or a solvent gas; or a step 3: the separated material is condensed or distilled, or pressurized or decompressed and the organic solvent is recovered; or step 4: solvent drainage Remove the water vapor or impurities or solvents other than the solvent; or Step 5: Use a moisture meter to determine whether the separation zone or the solvent filter removes moisture.

Description

Washing tower solvent recovery device and method

The invention relates to a special device and a special method for solvent recovery, which is a washing tower solvent recovery device, in particular to a washing tower and one or more special washing liquids for washing, adsorbing, desorbing, separating, condensing or distilling gas. Rectification, solvent recovery.

It is generally used for solvent recovery control of airflow scrubbers. Most of the market is dry adsorption, desorption, concentration separation and condensation, and solvent recovery. The traditional scrubber solvent recovery is not purified, but the solution is dissolved in water and the utilization rate is poor. It is rare to develop a washing tower series process or a solution of dissolved oil water by a washing tower type with a special washing liquid and a phase change state and a solvent purification and recovery.

Traditional solvent recovery mechanisms for solvent air are quite diverse, but most of them, such as dry adsorption, are ultra-large or traditional filled adsorption, and the cost of designing large and complex designs and the filtering structure of the filter material are relatively rare. Special progress, high energy saving and high efficiency mode, due to the wide plant area, high concentration of chemical gas, large air volume, and possibly a large amount of toxic gas, the traditional solvent recovery structure is not only poor in recovery efficiency, but also easy to block. The application of super large air volume and solvent amount.

It is generally applied to the solvent recovery of special plants. The principle is to use the filler and dry adsorption, desorption, concentration separation and condensation, solvent recovery, and the investment equipment volume and land cost are very large. The invention relates to the consumption of oil or substance in the washing liquid. Phase change separation or solidification point metamorphism separation to wash adsorption and desorption, oil, solvent separation condensation, solvent recovery, can be concentrated, without the need for high-priced concentrated runner. Therefore, the traditional solvent recovery method is not effective, the efficiency is about 6-7 percent, the fillers are often changed, and the quantity and cost are also very high, which cannot achieve economical practicability.

It is an object of the present invention to overcome the deficiencies of the prior art and to provide a new scrubber type solvent recovery apparatus.

Another object of the present invention is to provide a new washing column and one or more special washing liquids for gas adsorption, adsorption, desorption, separation and condensation, and solvent recovery. The technical problem to be solved is to make it more practical. Sexuality can improve economic efficiency, has improved efficiency in general, and has industrial utilization value.

It is an object of the present invention to overcome the deficiencies of the prior art and to provide a new special device and special method for solvent recovery.

The object of the present invention is to provide a special device and a special method for solvent recovery. Step 1: The organic substance is washed and adsorbed by the liquefied adsorbent (or is separated by a substance having a phase change state) in the washing liquid washing adsorption zone; or step two : the washing liquid adsorbing material in the regeneration and desorption zone of the washing liquid is subjected to separation member desorption, and the water-dissolving non-water-soluble separating member in the regenerating desorbing member is desorbed by the main substance The phase change substance and the solvent; or the third step: after the device is sucked and desorbed, the separated material is added to the phase change state to be added to the temperature change treatment device to recover the organic solvent; or the fourth step: the solvent filter is removed. Substance other than solvent; or Step 5: Use a moisture meter to determine whether the solvent water filter removes moisture.

The object of the present invention and solving the technical problems thereof can be further achieved by the following technical measures.

The above-mentioned washing tower type solvent recovery device comprises: a process windmill connected with a recovered solvent gas, a washing tower type washing adsorber, and a separation tank and a post-treatment condenser, wherein the washing is The tower washing adsorber comprises at least one washing tower type washing adsorption box device, and further comprises: an isolation space and the washing tower type washing adsorption box block, wherein the isolation space is used for separating the washing tower type Washing the adsorption washing zone and the washing liquid regeneration desorption zone in the washing tank block, the washing tower type washing adsorption tank block is a washing liquid containing the inlet and outlet gas to wash the adsorption zone and then connected to a washing liquid regeneration desorption zone; The washing liquid adsorbing material is disposed in the washing tower type washing adsorption box of the washing tower type washing adsorber, and comprises water and at least one selected from the group consisting of: an emulsifier, nitrogen, liquid nitrogen, nitrogen compound, Nitrogen (gas) substances, inert gases, inert gases, oils, oil derivatives, fats, fat derivatives, fatty acids, fatty acid derivatives, fatty acid esters, tannins Polyamide, diatomaceous earth, bone powder, zeolite, molecular sieve, activated carbon, tannin, activated alumina, porous adsorbent, resin, porous resin, some of which are liquefied or have liquefaction to produce phase change separation a substance, constituting a liquefied adsorbent; a separation tank for receiving a desorption substance capable of generating a phase change separation, the substance is derived from the washing liquid washing adsorption zone and the washing liquid regeneration desorption zone; a condenser, The system is connected to the separation tank to condense the phase metamorphic substance and the solvent in the separation tank; the washing liquid washing adsorption zone device is a vortex treatment device, and the washing liquid flows to the washing liquid regeneration desorption zone device, and the desorption is completed. The washing liquid is then refluxed to the washing liquid to wash the adsorption zone.

The above-mentioned washing tower type solvent recovery device is characterized in that a process windmill device connected with a solvent gas is connected; a washing liquid washing adsorption zone device is connected with the washing liquid adsorbing material before the washing liquid, and the washing liquid is connected with the recovered solvent gas. The solvent molecule can be recycled to produce a new mixed liquid; a washing liquid regeneration desorption zone device is a separating member, and the water-dissolving non-water-soluble separating member in the regenerated desorbing member is a separating member of a phase change substance and a solvent.

The washing tower type solvent recovery device described above, wherein the washing liquid washing adsorption zone further comprises: a gas inlet pre-filtering gas treatment device connected to the washing liquid washing adsorption zone.

The washing tower solvent recovery device described above, wherein the washing liquid washing adsorption zone further comprises: a gas filtering device disposed after the exhaust port, and is connected to the washing liquid washing adsorption zone.

a scrubbing type solvent recovery device as described above, wherein the washing liquid regenerates the desorption zone The oil-water separation device is selected from the following: centrifugal, reverse osmosis, scraping, roller, filter, gravity floating, inclined 钣 sediment separation, aeration separation, viscosity separation Type, decompression separation type, density difference separation type, medium separation type, separation principle of the isotropic flow separation principle, separation method of the turbulent boundary layer principle, liquid level difference separation type, heating separation type or ultrasonic separation type a device.

The washing tower type solvent recovery device as described above, wherein the washing liquid regeneration desorption zone further comprises a gas storage tank when the blower for desorbing the gas source is connected; and the desorption gas source of the washing liquid regeneration desorption zone is selected from the group consisting of At least one of the following: steam, nitrogen, solvent gas, oil and gas, carbon dioxide, air, hot air, cold air or a mixture thereof is used interchangeably.

The washing tower type solvent recovery device described above further comprises a demulsifying degree measuring instrument as a basis for judging whether or not the emulsification of the washing liquid washing adsorption zone into the washing liquid regeneration desorption zone is completed.

The scrubber type solvent recovery device described above further comprises a solvent water filter as a substance other than the solvent.

The scrubbing type solvent recovery device described above further comprises a moisture meter as a basis for judging whether or not the removal of moisture after the solvent purification is completed.

The washing tower solvent recovery method is the apparatus according to any one of the preceding items, wherein the method comprises the first step: the organic substance is washed and adsorbed by the liquidified adsorbent in the washing liquid washing adsorption zone; and the second step: the washing liquid The washing liquid adsorption material in the regeneration desorption zone is desorbed by the separation member, and the main substance desorbed is a phase change substance and a solvent; Step 3: after the device is sucked and desorbed, the separated substance is matched to achieve the phase change state, and the installation temperature is required. The treatment device is changed to recover the organic solvent.

The apparatus and method for washing column solvent recovery device according to the present invention are as follows: an isolation space and the washing tower type washing adsorption box block, wherein the isolation space is used for washing the washing liquid in the washing tower type adsorption adsorption box block. And the washing liquid regeneration desorption zone, the washing tower type washing adsorption block is a washing liquid containing the inlet and outlet gas to wash the adsorption zone and then connected to a washing liquid regeneration desorption zone, or the adsorption zone and the regeneration desorption zone function can be The alternating phase switching operation is used; or a desorption air source blower is used to cause the washing liquid in the regeneration desorption zone of the washing liquid to generate a sedimentation floating separation or aeration separation, or to float the gas and swirl it to the air blower for repeated use; Or a separating member, which separates or separates the purification zone for separating and purifying the oil-containing solvent or substance in the regeneration desorption zone of the washing liquid; a separation tank which is subjected to one or more solvents or concentrated solvent gases, including one or more a separation tank; a condenser or a distillation rectifier, which causes a phase change of the oil-containing solvent or substance or solvent or concentrated solvent gas of the separation tank Abnormal freezing point separation, comprising one or more condenser or a distillation rectifier.

Or a washing tower type solvent recovery device as described above, wherein the device is at least one washing liquid having a washing solvent for recovering a liquid substance which is subjected to phase transformation separation or freezing point metamorphism, and a recovery solvent. The washing adsorption zone or a washing liquid is a solvent regeneration desorption zone of oil-water separation or solvent water separation or substance water separation, or a solvent separation zone or a separation purification zone or a purification recovery zone.

definition:

◎ Phase change (phase transition): A phenomenon in which one phase changes to another phase.

◎ metamorphic point: the temperature point from one phase to another.

◎ Melting point and Freezing point The temperature at which the liquid reaches a state of equilibrium in a liquid state at its vapor pressure is called the melting point or freezing point.

◎ Freezing point - The freezing point is the temperature at which the crystalline material solidifies, and the different crystals have different freezing points.

◎Separation zone: only the washing liquid is separated (or has passed through the separation tank)

◎Separation and purification zone: the washing liquid is separated and condensed or distilled distillation

◎ Purification recovery zone: no separation of washing liquid and direct condensation or distillation distillation

◎ Separation member: is a separation zone or a separation purification zone or a purification recovery zone for separating or purifying the washing liquid to regenerate the components of the oil, solvent or substance contained in the desorption zone, and sometimes the entire zone is a separation component.

◎ Washing liquid adsorption material: It can be divided into three major liquefied types: inorganic, organic, inorganic/organic, and at least one of the liquefied adsorbents is within three liquefied species.

*Step 1 (An organic substance is washed by the liquefied adsorbent in the washing solution washing zone [or by a substance containing a phase change state]): a special device for solvent recovery and a special method, a closed scrubber side setting The air inlet further comprises: dust or gas glue or promotes nitrogen absorption or rejects and filters oxygen or the washing liquid washes the adsorption zone with a pre-filter gas treatment device; the other side of the gas outlet further comprises: intercepting nitrogen gas overflow, or rejecting And filtering the oil or water or organic matter, and then filtering the gas treatment device, at least one process windmill for recovering the solvent gas; the corresponding washing liquid is disposed at the lower side or the adjacent side of the tower, and then the solvent gas enters to generate gas and liquid solution. The washing liquid washes the adsorption zone, so that the gas entering the washing tower is mutually soluble and mutually absorbing, the medicinal washing strengthens the concentrated adsorption, and the adsorption solvent is washed by the oily substance or the substance having the phase change state separation or the freezing point metamorphosis separation. The washing liquid adsorption material may be nitrogen, liquid nitrogen, nitrogen compounds, nitrogen (gas) substances, inert gases or substances thereof, oils, oil derivatives, fats, fat derivatives, fatty acids, fatty acid derivatives or fatty acid esters. Or in combination with a slurry-based porous adsorbent material, in order not to damage the solubility of the solvent washing and dissolving, most of them may contain a high degree of inert gas or a substance thereof, an inert gas such as nitrogen, or a substance such as a part of a nitrogen compound or a nitrogen-containing substance. (qi) substances, some solvents are also absorbed by mineral oil, in fact, relative to the solvent must be matched with the oil to dissolve, as long as the control of the compounding technology can achieve this purpose, such as washing liquid containing liquidified adsorbent mixed fatty acids including C16, C18 Saturated and unsaturated fatty acids such as C20 can adsorb a large amount of solvent. The solubility of saturated fatty acids in organic solvents (usually acetone) is inversely proportional to the length of the carbon chain. Short-chain fatty acids are soluble in water, and chain lengths are increased in organic solvents. The solubility increases and the solubility in water decreases. The solubility ratio of the same unsaturated fatty acid to the solvent can also reach 1:1, and the highest ratio can reach 1 6, a polar solvent miscible with the fatty acid is very suitable mutual absorption, good dispersibility of the fatty acid and a solvent, non-polar solvent for dissolving an unsaturated And fatty acids, fats contain fatty acids, fatty acids, fats are easily soluble in solvents such as ether, chloroform, petroleum ether, hexane, benzene, methane, ethane, ethylene, propylene, butadiene, toluene, xylene, petroleum solvents, etc. Polar organic solvent, another decanoic acid, polyamide, diatomaceous earth, bone powder, zeolite, molecular sieve, activated carbon, tannin, activated alumina, porous adsorbent, resin or porous resin, or some of the mixture The slurry adsorption or liquefaction or the fat series can achieve the washing adsorption effect, or other liquid substances having the phase separation state or the freezing point metamorphic separation can achieve the washing adsorption effect, wherein the washing liquid adsorption material is made into the liquidized porous adsorption material. : The water ratio can reach 1:1, or add appropriate amount of stabilizer and emulsifier, etc.; a small amount of other substances can also be added, so that the solubility of the combined oil in the liquid adsorbent can reach 30%, so the oil and the solvent are mixed. The solvent for dissolving the adsorption amount can reach 30-180%.

Alternatively, the waste solvent gas can be used in the washing and desorption zone by the washing liquid and the washing liquid regeneration and desorption zone function, and the washing liquid regeneration desorption zone in the switching is decompressed, and the washing liquid is heated. Or vapor) desorbing the solvent gas, wherein the degree of decompression and the desorption temperature of the hot gas may be determined according to the type of the desorbing solvent gas, so that the partially concentrated solvent gas is directly transferred to the condensation, and the crystal is cooled to obtain a liquid solvent.

Fat, fatty acid: fat is a solid oil at room temperature (oil that is liquid at room temperature is called oil), mostly derived from plant or human or animal fat tissue, is a carboxylic acid ester, from carbon , hydrogen, oxygen three elements. Fatty acid refers to a long aliphatic hydrocarbon chain containing a carboxyl group at one end, which is an organic substance. The formula of a linear saturated fatty acid is C(n)H(2n1)COOH, and the lower fatty acid is a colorless liquid. The fatty acids are waxy. Fatty acid is the simplest kind of fat. It is a component of many more complex fats, fats, derivatives of fatty acids, fatty acids, fatty alcohols, fatty amines, fatty acid esters or polyacid esters. Polyol fatty acid esters; higher alcohols and higher fatty acids; lecithin derivatives.

Inert gas or its substance: In an atom of an element similar to an inert gas, the arrangement of electrons in each electron layer is approximately just a stable number. Therefore, atoms are less likely to lose or acquire electrons, and it is more difficult to chemically react with other substances. Inert gases such as nitrogen, such as nitrogen (gas) substances, kaolin, charcoal are inert substances, inert gases or their substances are pure. When the organic solvent is dissolved, substances such as some azo compounds, nitroso compounds, carbon nitrogen compounds, oxygen nitrogen compounds, inorganic nitrogen compounds, organic nitrogen compounds, amino acids, boron nitride, etc., which are more likely to generate inert gases, are present. The compound, the inert gas or its substance can be absorbed by the stable solvent.

Solvent and oil and water compatibility:

The solvent can be divided into water, a hydrophilic organic solvent and a lipophilic organic solvent. The dissolved substance also has hydrophilicity and lipophilicity. The molecular structure of the organic compound has many hydrophilic groups, and its polarity is large and is sparse in oil; some hydrophilic It has few polar groups and its polarity is small and it is sparse in water. This hydrophilicity, lipophilicity and the extent of this are directly related to the molecular structure of the compound. In general, the two components of the same basic nucleus have the same polarity of the functional groups in the molecule, or the greater the number of polar functional groups, the greater the polarity of the entire molecule, the stronger the hydrophilicity, and the weaker the lipophilicity. The more non-polar part of the molecule Larger, or longer carbon bonds, the polarity is less, the lipophilicity is strong, and the hydrophilicity is weaker.

The nature of various solvents is also related to their molecular structure. For example, methanol and ethanol are relatively hydrophilic solvents, and their molecules are relatively small, and there are hydroxyl groups, which are similar to the structure of water, so they can be mixed with water arbitrarily. Although the butanol and pentanol molecules have hydroxyl groups, they remain similar to water, but the molecules gradually increase, and the water properties are gradually alienated. Therefore, they are partially soluble with each other, and after they are mutually soluble and saturated, butanol or pentanol can be combined with the moisture layer. Chloroform, benzene and petroleum ether are hydrocarbon or chlorocarbon derivatives, diethyl ether, ethyl acetate, dichloroethane, etc., which have no oxygen in the molecule and are a lipophilic solvent.

The above considerations should be made to select suitable oils and application-adapted solvent gases, suitable solvent gases and oils, preferably less soluble in the required components when cold, and more soluble in normal conditions, making the system solvent recovery operation economical and practical.

Solvent and oil and adsorbent compatibility:

Adsorbent: Commonly used adsorbents are decanoic acid, polyamide, diatomaceous earth, bone powder, zeolite, molecular sieve, activated carbon, tannin, activated alumina, porous adsorbent, porous resin or a mixture thereof for liquefaction, etc. For polar adsorbents, the polarities of the components are large and strongly adsorbed. The non-polar adsorbents have higher adsorption capacity for aromatic compounds than aliphatic compounds, and the adsorption capacity for macromolecular compounds is greater than that of small molecular compounds. The adsorption formed in the solvent is stronger than in the fat-soluble solvent.

Washing tower pre-treatment device filter:

Containing contaminating particulate gas gel or rejecting and filtering oxygen to pass in a horizontal direction perpendicular to one side of the reverse osmosis membrane fiber bed. When these particles attempt to cross the reverse osmosis membrane fiber bed, they will be reverse osmosis due to the particle size of the particle. Captured by the membrane fiber bed, the collected aerosol particles are further composed into large particles, collected on the surface of the reverse osmosis membrane fiber bed of the filter by gravity, collected under the surface of the reverse osmosis fiber, and discharged or returned to the process system for recovery. Use, reject and or filter oxygen to ensure that the solvent will not be decomposed. In order to maintain the longevity of the liquid, the clean air produced by the other side is washed into the adsorption zone by the washing liquid. Capture and collect gas particles, particles larger than 2μm to 3μm or reject and filter oxygen collected by inertial impact and direct interception, while smaller particle glues are collected by Brownian motion.

The pre-treatment includes a pre-filter gas treatment device.

Similarly, after the washing liquid washes the adsorption zone to reject and filter the oil or water or organic matter, the filter gas treatment device generally uses a special filter oil or a defogging medium of water or organic matter to maintain the air quality.

Similarly, the scrubbing type solvent recovery device, wherein the washing liquid washes the washing liquid in the adsorption zone to promote flow or phase change, the washing liquid washing adsorption zone or the washing liquid thereof further comprises: arc vortex stirring or vortex stirring of the washing liquid Or a swirling vortex flow treatment device.

* or step 2 (a washing liquid adsorbing material in the washing liquid regeneration desorption zone is subjected to separation member desorption, and includes a water-dissolving non-water-soluble separating member in the regenerated desorbing member, and the main substance of the desorption is phase Metamorphic substance and solvent): The washing liquid regenerates the washing liquid adsorbing material in the desorption zone, which is desorbed into a regenerated separating oil, a solvent or a substance or a solvent gas.

The washing liquid regeneration desorption zone, or the demulsifying method, the oil plus organic solvent gas (recovered solvent exhaust gas) or other drugs may be emulsified, so it is determined by the deemulsification degree to determine the degree of emulsification. (The washing liquid washes the adsorption zone into the washing liquid regeneration desorption zone).

The washing liquid washes the washing liquid running in the adsorption zone to a part of the washing liquid regeneration desorption zone or the alternating phase switching regeneration desorption zone, and then carries out oil, substance or solvent and separates from water, or utilizes desorbed gas source or hot gas. (or steam) desorption blower, which is used for causing the washing liquid in the regeneration and desorption zone of the washing liquid to generate sedimentation floating separation or aeration separation, or to float the gas and swirl it to the air blower for repeated use, and design the washing liquid to be destroyed. It can produce regeneration and desorption of washing liquid, and then can be separated from water by oil, substance or solvent. There are many kinds of destruction devices. For example, the regenerative desorption zone device has static liquid regeneration and desorption or non-static liquid regeneration and desorption. Device or desorption device or oil-water separation and desorption device (the first and fourth figures are the separation zone concept): either centrifugal or reverse osmosis or scraping or roller or filter or gravity floating or inclined 钣 precipitation Separate or aerated separation or viscous separation or separation of pressure separation or differential separation or separation of medium or isotropic separation or turbulent boundary layer principle separation or liquid A washing solution regeneration desorption device of a differential separation type or a heating separation type or an ultrasonic separation type. A scrubbing type solvent recovery device using a desorbed gas source blower, wherein the desorbed gas source can be used for steam, nitrogen, solvent gas, oil and gas, carbon dioxide, air, hot air, cold air or a mixture thereof, but is not To destroy the stability of fatty acids, most of them use high-intensity inert gas, such as nitrogen, solvent gas, oil and gas, carbon dioxide, etc., and can be connected to a gas storage tank or a hot gas source. a scrubbing type solvent recovery device, wherein the washing liquid washes the washing liquid of the adsorption zone to the washing liquid regeneration desorption zone, and after the desorption is completed, the washing liquid is returned to the washing liquid washing adsorption zone to repeatedly adsorb, desorb or heat (or steam) desorption → or oil, substance or solvent and separated from water → the separation of the third step to achieve phase change state separation. The solubility of the same substance changes with temperature and environment. With this property, in the solid, liquid, and gaseous substances, the movement mode of the particles and the distance between the particles are different. The liquefied porous adsorbent material which is regenerated and desorbed in this zone is allowed to be partially precipitated and returned to the washing liquid to wash the adsorption zone.

a scrubbing type solvent recovery device, wherein the water-dissolving non-water-soluble separating mechanism or material in the separating member of the washing liquid regeneration desorption zone before the separating tank is a separating member separated from water by oil, substance or solvent, wherein The water-dissolving non-water-soluble separation mechanism or the cross-section of the material in the separating member may further form a groove or an inverted groove or a V-shaped or inverted V-shaped structure, and the separation mechanism mainly separates the oil or the substance mixed solvent into the separation tank. Sometimes the washing liquid regeneration desorption zone may be the separation and condensation of the separation and purification zone, and the separation component is the regeneration and desorption zone of the washing liquid (as described in the second figure), and the same separation zone or purification recovery zone is also the same. .

In fact, if step 2 and/or step 3 are omitted, only the washing liquid in step 1 washes the adsorption zone, and the solvent recovery of oil, substance or water is considered as solvent recovery, and is also included in the patent. Inside. (A washing tower type solvent recovery device according to the third figure, characterized in that a process windmill connected with a solvent gas is connected; a washing liquid washing adsorption zone is connected to a washing solvent having a phase change state separating the liquidified substance, and a washing solvent is recovered. a washing liquid in which the washing liquid washes the adsorption zone and the above-mentioned recovered solvent gas are produced in a solvent mixture and can be recycled to produce a new mixed liquid.

Alternatively, the waste solvent gas can be used in the washing and desorption zone by the washing liquid and the washing liquid regeneration and desorption zone function, and the washing liquid regeneration desorption zone in the switching is decompressed, and the washing liquid is heated. Or vapor) desorbing the solvent gas, wherein the degree of decompression and the desorption temperature of the hot gas may be determined according to the type of the desorbing solvent gas, so that the partially concentrated solvent gas is simultaneously directly transferred to the condensation, and the crystal is cooled to obtain a liquid solvent. (Separation and purification zone concept)

* or step 3 (after the device is sucked and desorbed, the separated material is combined with the temperature change treatment device to recover the phase change state to recover the organic solvent): condensation or distillation distillation in the separation tank and recovery of the organic solvent.

The process of changing a substance from a liquid to a solid is called solidification. The temperature at which the object begins to solidify is called the freezing point. The organic solvent, water, and oil dissolve the substance in which the solid or gaseous substance is mixed with the liquid substance, and the substance is uniformly dispersed in the molecular state. The temperature at which the liquid solid reaches equilibrium in its gas pressure is called the freezing point, and the separated substance is condensed by the condenser, or pressurized or decompressed or vacuum controlled to achieve phase change separation or metamorphic point separation. The separation skill of the mixture is suitable for the separation between liquid and liquid-insoluble solids, or between solids with different solubility. The use of different temperatures can cause the change of the solubility of the substance to separate substances, fatty acids and fats in organic solvents. The solubility decreases with the increase of the length of the carbon chain, and increases with the increase of the number of double bonds, and this difference in solubility is more pronounced with the decrease of temperature, and the mixed fat is separated according to the freezing point. In the recovery of oil or solvent and water, liquid substances, during the solidification process, the temperature gradually loses fluidity, and finally becomes solid. During the solidification process, it does not have a certain freezing point, but corresponds to a certain temperature range. By changing the freezing point and viscosity of the oil, the freezing point of the fat is higher than that of the solvent, and the fat quickly becomes a solid solvent or a liquid, so the solvent can be separated.

In particular, heavy oils have the characteristics of high boiling point and high freezing point. These heavy oils are in a large amount of low boiling point and low freezing point solvent substances when they enter a high boiling point high freezing point oil with high temperature, and are fully condensed and contacted, which is easy to produce oil and substances. Solvent, water separation phenomenon, can generally contain dissolved water, due to poor specific gravity, and separated water is deposited under the equipment, from which organic solvent can be recovered, which condenses energy in a small space separated by oil, solvent and water. The energy consumed to recover large volumes of condensation is much less.

Similarly, other solvent substances such as polyphenols have extremely low solubility in liquid and supercritical CO2, such as high vacuum, high freezing point, high purity, heat sensitivity, etc., and breakpoints; metamorphic points, three-state changes of substances refer to substances. The transition between solid, liquid, and gaseous states, the pressure drop of the solvent in the solution, the decrease in freezing point, the increase in boiling point, and the osmotic pressure are all in the solution. According to this property, the solvent can be used to extract the oil from their aqueous solution. separate from.

In the same way, another way, especially heavy oil, has the characteristics of high boiling point and high freezing point. These heavy oils are fully refined when a large amount of low boiling point and low freezing point solvent substances enter high-boiling point high-solidification point oil with high temperature. Distillation contact, easy to produce oil, substance, solvent, water separation phenomenon, can generally contain dissolved water, and the separated water is evaporated at the other end of the device, but the boiling point of fat and fatty acid is higher, and decomposition may occur when distilled under normal pressure. Therefore, it is necessary to carry out distillation under reduced pressure, and thus the organic solvent can be recovered. The distillation can be divided into oil, solvent and water, including extractive distillation, azeotropic distillation, etc., for example, the distillation work can be divided into vacuum fractionation. And molecular distillation two kinds of methods, by controlling the temperature and vacuum, that is, reducing the boiling point under reduced pressure, reducing heat denaturation and other means to achieve the purpose of separation and purification.

Understand the significance of vacuum distillation, master the operation method of vacuum distillation, learn to refine 1-2 common solvents. ...some organic compounds, especially those with high boiling point vacuum distillation (200 degrees or more), need to be distilled under special pressure.

According to the above, a scrubbing type solvent recovery device, wherein the separated material is combined with a condenser condensation or distillation rectifier, or pressurized or reduced pressure or vacuum control or cold heat exchange to achieve phase change separation or solidification point metamorphism separation, and our recovery is not Like the traditional washing and dissolving in water, it is purified by purifying the deionized water or dissolved in oil and water.

a washing tower type solvent recovery device, wherein the washing liquid washes the washing liquid of the adsorption zone or the separation washing liquid of the purification recovery zone or the separation zone, and simultaneously condenses or distills and rectifies, and then recovers the solvent, and then the washing liquid is returned to the washing liquid. The adsorption zone is further washed, and further comprises a reservoir for storing the solvent, and the reservoir is connected to the separation tank or the separation purification zone or the purification recovery zone or the solvent water filter (step 4).

The washing tower type solvent recovery device described above, wherein the washing liquid washes the washing liquid of the adsorption zone to the separation zone or the separation and purification zone or the purification recovery zone of the washing liquid regeneration desorption zone, and the washing liquid contains impurities or solvent external substances. It can be removed by the technique of filter or equipment, and then the washing liquid is returned to the washing liquid to wash the adsorption zone. For example, the solid solution containing impurities has a lower freezing point than the pure substance, so that the impurities are melted in the liquid solution. Solid matter separation of solid matter.

The washing tower solvent recovery device as described above, wherein the washing liquid in the separation zone or the purification recovery zone or the separation and purification zone of the washing liquid regeneration desorption zone is refluxed to the washing liquid washing adsorption zone, and a stirring zone may be provided to the local portion. The mixture is uniformly mixed or filtered and then refluxed to the washing liquid to wash the adsorption zone.

In fact, it is ok to jump to step 3, and the separation mechanism or the separation member of the material is disposed in the washing liquid washing adsorption zone of step one, as long as it is a filtered oil-water separation (second figure separation and purification zone concept) or washing adsorption. Washing solvent in the area, washing solvent for recovering the solvent (separate water, washing liquid other than organic solvent gas and used for recovering the solvent) directly to the condensation or distillation distillation (referring to the separation member itself) without separating the components and recovering the organic solvent , does not affect the operation of the washing liquid washing adsorption zone, directly to the purification and recovery zone, the same purpose can be achieved by the same reason. (as described in the second picture)

In fact, if step 3 is omitted, the recovery of solvent containing oil or substances is also considered as solvent recovery and is also included in the patent. (concept of separation zone)

In fact, if the recovery of a plurality of solvents, condensation or distillation rectification can be carried out in the separation tank and the organic solvent is recovered, and separated according to the freezing point or the boiling point.

* or step 4 (solvent filter removes solvent): solvent filter removes water vapor or impurities or solvents other than solvent

The method for removing water in a solvent and removing water in an organic solvent, the common methods for dehydrating in an organic solvent are mainly divided into: Desiccant dehydration method; Membrane separation method for pervaporation gasification; Special distillation method: including extractive distillation, azeotropic distillation and the like. These methods were analyzed and discussed.

The above-mentioned inorganic porous membrane method for removing water vapor and its permeation mechanism in the condensable gas, or a coalescer to treat water vapor or impurities or solvents other than the solvent is most preferable, and the pervaporation membrane device is very good, water As a kind of impurity which is widely distributed and difficult to remove, it has an important influence on the quality of the product. Therefore, the removal of trace moisture in the organic solvent is very important in the refining of the product. The dehydration by the adsorption porous membrane method is a kind of organic water in the porous membrane method. Removal, such as aromatic compounds, hexane, cyclohexane, carbon six oil and other oil solvents in the removal of trace water, trace water in organic germanium removal and dehydration and recycling of solvent in the chemical industry, Multi-cycle filtration and dehydration, and a certain size of pores in the membrane gel, the bulky molecules can not penetrate into the pores and the solvent removes water, the solvent should be used in the system to ensure the reproducibility of the test results, To ensure that the whole system is good, further the system uses vacuum filtration to degas, the hydrocarbon compound is dehydrated in a gas phase, and vacuum filtered with a 0.45 μm filter to remove the gas in the solvent. Bubbling, taking tetrahydrofuran, ethylene glycol dimethyl ether, isopropanol and ethanol as examples, summed up the removal method of water in organic solvent, the amount of solvent in the solvent is small, and the water in the solvent must be completely removed. In the above way, the solvent or oil can remove water to 5 PPM.

* or step 5: use a moisture meter to determine whether the separation and purification zone or solvent water filter removes moisture

Moisture meter, a measuring instrument for moisture content, can quickly determine the moisture contained in a substance, can be used to detect moisture in various environments, remove the commonly used measuring tools for water gas completion, and can be the shortest The maximum power is reached in the time, and the solid, granule, powder, colloid and liquid are determined. The moisture meter solid water evaporation device is connected to the control operation program, which is suitable for the moisture measurement of the above sample, and the moisture in the solvent can be measured appropriately. The wetness, the percentage of moisture obtained, the digital display is intuitive and accurate, and it can be judged whether the moisture meter removes the moisture in the solvent water filter.

Of course, there are many principle modes for the determination of the moisture meter, and it is possible to connect the system device to control the operating program to predict whether the water vapor removal in the solvent water filter is completed.

The above description is only an overview of the technical solutions of the present invention, and the above-described and other objects, features and advantages of the present invention can be more clearly understood. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings.

In order to further explain the technical means and efficacy of the present invention for achieving the intended purpose of the invention, the apparatus and method for solvent recovery according to the present invention will be described below with reference to the accompanying drawings and preferred embodiments.

The definitions and implementations, structures, features, and functions of the body are described in detail below.

definition:

◎ Phase change (phase transition): A phenomenon in which one phase changes to another phase.

◎ metamorphic point: the temperature point from one phase to another.

◎ Melting point and Freezing point The temperature at which the liquid reaches a state of equilibrium in a liquid state at its vapor pressure is called the melting point or freezing point.

◎ Freezing point - The freezing point is the temperature at which the crystalline material solidifies, and the different crystals have different freezing points.

◎Separation zone: only the washing liquid is separated (or has passed through the separation tank)

◎Separation and purification zone: the washing liquid is separated and condensed or distilled distillation

◎ Purification recovery zone: no separation of washing liquid and direct condensation or distillation distillation

◎ Separation member: is a separation zone or a separation purification zone or a purification recovery zone for separating or purifying the washing liquid to regenerate the components of the oil, solvent or substance contained in the desorption zone, and sometimes the entire zone is a separation component.

◎ Washing liquid adsorption material: It can be divided into inorganic, organic, inorganic/organic three liquefied species, at least one of which is within the three liquefied species.

Structure:

◎ The above-mentioned washing tower type solvent recovery device comprises: a process windmill connected with a solvent gas, a washing tower type washing adsorber, and a separation tank and a post-treatment condenser, wherein the The washing tower type washing adsorber comprises at least one washing tower type washing adsorption box device, and further comprises: an isolation space and the washing tower type washing adsorption box block, wherein the isolation space is used for separating the washing tower The washing liquid in the adsorption adsorption block washes the adsorption zone and the washing liquid regeneration desorption zone, wherein the washing tower type adsorption adsorption block is a washing liquid containing the inlet and outlet gas to wash the adsorption zone and then connected to a washing liquid regeneration desorption zone; a washing liquid adsorbing material, disposed in the washing tower type washing adsorption box of the washing tower type washing adsorber, comprising water and at least one selected from the group consisting of: emulsifier, nitrogen, liquid nitrogen, nitrogen compound , nitrogen (gas) substances, inert gases, inert gases, oils, oil derivatives, fats, fat derivatives, fatty acids, fatty acid derivatives, fatty acid esters, hydrazine , polyamide, diatomaceous earth, bone powder, zeolite, molecular sieve, activated carbon, tannin, activated alumina, porous adsorbent, resin, porous resin, some of which are liquidified or have a liquid phase which produces phase change separation a liquefied adsorbent; a separation tank for receiving a desorption substance capable of generating a phase change separation, the substance is derived from the washing liquid washing adsorption zone and the washing liquid regeneration desorption zone; a condenser And connecting to the separation tank to condense the phase metamorphic substance and the solvent in the separation tank; The washing liquid washing adsorption zone device is an eddy current processing device, and the washing liquid flows to the washing liquid regeneration desorption zone device, and after the desorption is completed, the washing liquid is returned to the washing liquid washing adsorption zone.

◎ A washing tower solvent recovery device characterized by: a process windmill device connected with a solvent gas recovery; a washing liquid washing adsorption device connected to the washing liquid adsorbing material before, the washing liquid and the recovered solvent gas are The solvent molecule can be recycled to produce a new mixed liquid; a washing liquid regeneration desorption zone device is a separating member, and the water-dissolving non-water-soluble separating member in the regenerated desorbing member is a separating member of a phase change substance and a solvent.

Example 1.

The above-mentioned washing tower type solvent recovery device comprises: at least one process windmill 121 for connecting and recovering solvent gas, a washing tower type washing adsorber, or a desorbing gas source 15, or a separating member 19, and a separation tank 18 (for receiving a desorption substance capable of generating a phase change separation, the substance is derived from the washing liquid washing adsorption zone and the washing liquid regeneration desorption zone) and post-processing a condenser 20 The separation tank is connected to a distillation rectifier, wherein the scrub column solvent recovery unit 8 is characterized in that the scrub column scrubber adsorber is composed of one or more scrub column scrubber adsorption tank blocks 81, and The utility model further comprises: an isolation space 161 and the washing tower type washing adsorption tank block 81, wherein the isolation space 161 is used for separating the washing liquid washing adsorption zone and the washing liquid regeneration desorption zone in the washing tower type washing adsorption tank block 81. The washing tower type washing adsorption tank block is a washing liquid containing the inlet and outlet gas to wash the adsorption zone 13 and is connected to a washing liquid regeneration desorption zone 14, or the adsorption zone and the regeneration desorption zone function can be switched and operated alternately. * Please refer to the washing liquid washing adsorption zone 13 in Figures 1 to 4, step one (one organic substance in the washing liquid washing adsorption zone is liquefied by the liquefied adsorbent [or contained in the material containing the phase change state]): A scrubbing type solvent recovery device 8 is provided with a gas inlet at a closed scrubbing tower side, further comprising: a pre-filter gas treatment device 9 connected to the washing liquid washing adsorption zone 13; or an outlet port on the other side The utility model comprises: a post-filtration gas treatment device 10 connected to the washing liquid washing adsorption zone 13 and at least connected to a process windmill 121 for recovering solvent gas; a corresponding washing liquid 11 is arranged at a lower side or an adjacent side of the inside of the tower, and The adsorption solvent is washed by the oil or substance of the washing liquid 11 having a phase change state separation or a freezing point metamorphosis separation. The washing liquid adsorption material 30 is disposed in the scrubber type adsorber, and may be nitrogen, liquid nitrogen, nitrogen compounds, nitrogen-containing substances, inert gases or substances thereof, oils, oil derivatives, fats, Fat derivatives, fatty acids 40, fatty acid derivatives or fatty acid esters 41 (as shown in the fifth figure), in order not to destroy the solubility of solvent washing and dissolution, most of them may contain a high degree of inert gas or a substance thereof, an inert gas such as nitrogen 25, Or a substance thereof such as a part of a nitrogen compound 25, a nitrogen (gas) substance. For example, the washing liquid 11 contains a liquefied adsorbent 30, a saturated fatty acid derivative such as fatty acid 40, a fatty acid, a fatty acid derivative, and the like, and can adsorb a large amount of solvent. The solubility of the saturated fatty acid 40 in an organic solvent is good, and the unsaturated fatty acid 40 The solubility ratio with the solvent can also reach 1:1, the highest ratio can reach 1:6. The polar solvent is very suitable for the mutual solubility of fatty acid 40, and it has good dispersibility in fatty acid 40 and solvent, non-polar solvent. Suitable for dissolving unsaturated fatty acids 40, fatty acids, fats 40 are easily soluble in solvents, and other acids, polyamides, diatomaceous earth, bone powder, zeolites, molecular sieves, activated carbon, tannins, activated alumina, porous adsorbent 30 or porous The resin or a part of the mixture is slurried or liquefied or mixed with the fat 40 series to achieve the washing adsorption effect, or other liquid substances having a phase change state separation or a freezing point metamorphic separation can achieve the washing adsorption effect, wherein the washing liquid is adsorbed. The material 30 is made into a liquidized porous adsorbing material 30: the ratio of water to water can be 1:1, or an appropriate amount of stabilizer and emulsifier can be added; a small amount of other substances can also be added to make the oil have solubility in the liquid adsorbent 30. It reaches 30%, so the solvent that dissolves the adsorption amount between the oil and the solvent can reach 30%--180%.

The scrubbing type solvent recovery device described above, wherein the washing liquid washes the washing liquid 11 of the adsorption zone 13 for the purpose of promoting flow or phase change, or may be combined with refueling or dosing, or the washing liquid washes the adsorption zone 13 or its washing. The liquid 11 further includes an vortex flow treatment device including arc vortex agitation or vortex agitation or vortex swirling of the washing liquid 11, and is connected to the washing liquid regeneration desorption zone 14. The principle of the washing liquid washing adsorption zone 13 is as follows: a swirling washing tower is adopted, and the washing liquid 11 is more fluidized and absorbed in the swirling washing tower to achieve the liquid fluidized bed effect, and the liquid adsorbent 30 is mixed with the solvent-soluble substance in the above-mentioned manner. The solvent exhaust gas which is not compatible with the pro-solvent is subjected to a mixed reaction, and the exhaust gas is agglomerated by an infinite number of small swirls and the dissolution reaction is accelerated, and then the solvent recovery by the washing liquid washing adsorption zone 13 is completely recovered. The gas reaction structure is dissolved and arranged in a solvent-soluble substance by dissolving the reaction liquid, combined into a mixture, and then separated from the freezing point, and the condenser 20 is separated and recovered. Or another way, as shown in the fifth figure, the waste solvent gas is further subjected to the above-mentioned vortex washing, and the washing liquid washing adsorption zone 13 and the washing liquid regeneration detaching zone 14 function can be alternately used for switching operation, and the gas switching valve 27 is matched. The washing liquid regeneration desorption zone 14 in the switching is decompressed, and the washing liquid is desorbed by the hot gas (or steam) 15 , wherein the decompression degree and the hot gas desorption temperature may be determined according to the type of the desorbing solvent gas, thereby partially The concentrated solvent gas is directly transferred to the condenser 20, and cooled to obtain a liquid solvent.

* or step 2 (the washing liquid adsorbing material in the washing liquid regeneration desorption zone is desorbed by the separating member, and the water-dissolving non-water-soluble separating member in the regenerating desorbing member is desorbed, and the main desorbing substance is a phase change substance and a solvent): The washing liquid regenerating material 30 regenerates the washing liquid adsorbing material 30, which is desorbed into a regenerated separating oil, a solvent or a substance, and the washing liquid 11 washes the portion of the washing liquid 11 which is operated by the adsorption zone 13 to the washing liquid regeneration desorption zone 14 Or alternating phase-switching regeneration desorption zone 14 followed by oil, substance or solvent and water separation zone 17, or desorption gas source 15 such as steam, nitrogen, solvent gas, oil and gas, carbon dioxide, air, hot air , a cold air or a mixture thereof, or a hot air (or steam) desorption 15 blower 12, which is used to cause the washing liquid 11 of the washing liquid regeneration desorption zone 14 to generate a separate precipitation floating or aeration separation, or After the gas is floated and swirled back to the air blower 12, the washing liquid 11 is designed to be destroyed, and the washing liquid 11 can be regenerated and desorbed, and then the oil, substance or solvent can be separated from the water, and the water is separated. There are many kinds of devices, such as the regenerative desorption zone 14 device, which is divided into static liquid regeneration desorption or non-static liquid regeneration desorption, destruction device or hot gas (or vapor) desorption device or oil water separation device (the first and fourth figures are Separation area At least one of them: centrifugal or reverse osmosis or scraping or roller or filter or gravity floating or inclined 钣 precipitation separation or aeration separation or viscosity separation or decompression separation or density difference A separation or turbulent boundary layer principle separation or liquid level separation separation or heating separation or ultrasonic separation type regeneration solution for separation or medium separation or anisotropic flow separation. Or using the blower 12 of the desorption gas source 15 of the scrubbing type solvent recovery device 8, wherein the desorbed gas source 15 can be nitrogen gas 25 or hot gas, so as not to damage the stability of the fatty acid 40 and can be connected to a gas storage tank. 16, or hot gas (or steam) source. The washing tower solvent recovery device 8 is configured, wherein the washing liquid 11 of the washing liquid washing adsorption zone 13 flows to the washing liquid regeneration desorption zone 14, and after the desorption is completed, the washing liquid 11 is returned to the washing liquid washing adsorption zone 13, repeating Adsorption → desorption or hot gas (or vapor) desorption → or oil, substance or solvent and with the separation of the water separation zone 17 → step three to achieve phase change state separation. In the liquefied porous adsorbent material 30 of the washing liquid regeneration desorption zone 14, we let it be partially precipitated through a stirring zone or a filtration splitter 23 to be partially mixed or filtered to be evenly distributed and then refluxed to the washing liquid washing adsorption zone. 13.

a scrubbing type solvent recovery device 8, wherein the separation mechanism or material in the separation member 19 of the washing liquid regeneration desorption zone 14 before the separation tank 18 is water-soluble, non-aqueous, or oil-soluble, and is separated from the water. The realization of 17 wherein the water-dissolving non-water-soluble separation mechanism or the cross section of the material in the separating member 19 can further form a groove or an inverted groove or a V-shaped or inverted V-shaped structure, and the separation mechanism mainly mixes the oil or the substance with the solvent. The water is separated into the separation tank 18, and sometimes the washing liquid regeneration desorption zone 14 may be separated and condensed by the separation and purification zone 181, which is the separation member 19 or the washing liquid regeneration desorption zone 14 (as shown in the second figure). ), the same is true for the separation zone or the purification recovery zone.

In the case of the washing liquid regeneration desorption zone, or the emulsification method, the oil is added with the organic solvent gas (the solvent exhaust gas recovered) or other drugs, and the emulsification phenomenon is determined by using the demulsifying degree measuring instrument 46 to determine the degree of emulsification. Step 2 (washing liquid washes the adsorption zone 13 into the washing liquid regeneration desorption zone 14).

Or a kind of advection oil separation, solvent pool, gravity separation of oil, solvent and water, system operation and maintenance is easy, the washing liquid 11 is passed through the advection pool, the solid impurities are precipitated and the sludge is reflowed, and the washing liquid is in the sedimentation tank. The residence time is 3.5 hours, the removal rate of suspended solids is about 70%, or the nitrogen aeration is circulated by the air blower 12, and the oil and solvent are effectively controlled by the bubbles, and the microbubble water flow stagnates for a long time (3.0 hours). ), the level flow rate is about 1.5mm / s, and finally in the clarification area, oil, solvent floating and water separation, intercepted oil, solvent products, regularly removed by the freely rotating oil collection, solvent tube.

Or another way of the example, as shown in the fifth figure (the concept of the separation and purification zone), the waste solvent gas is further washed by the washing liquid to wash the adsorption zone 13 and the washing liquid regeneration desorption zone 14 can be used in an alternate phase switching operation, and the gas switching valve 27 is matched. The washing liquid regeneration desorption zone 14 in the switching is decompressed, and the washing liquid is desorbed by the hot gas (or steam) 15 , wherein the decompression degree and the hot gas desorption temperature may be determined according to the type of the desorbing solvent gas. The concentrated solvent gas is simultaneously transferred directly to the condenser 20, and cooled to obtain a liquid solvent.

*Please refer to the materials separated in the first and second figures to achieve the phase change state separation to add the temperature change treatment device to recover the organic solvent, or step 3: separate the condenser 18 in the tank 18 or the distillation rectifier 24 The organic solvent is recovered, and the separated material is condensed by the condenser 20, or pressurized or reduced pressure or vacuum controlled to achieve phase change separation or solidification point metamorphism separation. The difference in solubility of fatty acids and fats 40 in organic solvents is more pronounced with the decrease of temperature, and the mixed fat 40 is separated according to the freezing point of the mixture, in the oil or solvent recovered and the liquid substance in water. The fat 40 has a higher freezing point than the solvent, so the solvent can be separated.

In particular, heavy oils have the characteristics of high freezing point. These heavy oils enter the high freezing point oil with high temperature when a large amount of low-solidification point solvent substances are in contact with the condenser 20, which is easy to produce oil, substance, solvent and water separation. The interval 17 phenomenon can generally contain dissolved water, and the separated water is deposited under the apparatus, from which the organic solvent can be recovered.

In the same way, another method, especially heavy oil, has a high boiling point. These heavy oils are easily contacted when a large amount of low-boiling solvent substances enter a high-boiling oil stored at a relatively high temperature and are sufficiently contacted by the rectifier 24. The phenomenon of oil, substance, solvent and water separation interval 17 can generally contain dissolved water, and the separated water is evaporated at the other end of the device, and the organic solvent can be recovered therefrom, and the rectifier 24 is separated in the oil, substance, solvent and water intervals. Including extraction rectifier 24, azeotrope distillation 24 method, etc., such as distillation, the actual work can be divided into two methods: vacuum distillation and molecular distillation, by controlling the temperature and vacuum, that is, reducing the boiling point, reducing heat Degeneration and other means to achieve the purpose of separation and purification.

In the above, the scrubbing type solvent recovery unit 8 wherein the separated material is combined with the condenser 20 to condense or distillate the rectifier 24, or pressurized or reduced pressure or vacuum controlled or cold heat exchange to achieve phase change separation or solidification point metamorphic separation.

The scrubbing type solvent recovery device 8 is configured to wash the washing liquid of the adsorption zone 13 or the separation recovery zone of the separation zone 26 or the separation zone while the condenser 20 or the distillation rectifier 24 is finished, and then the solvent is recovered. The lower washing liquid 11 is refluxed to the washing liquid washing adsorption zone 13, and further comprises a liquid storage tank 21 for storing the solvent, and the liquid storage tank 21 is connected to the separation tank 18 or the separation purification zone 181 or the purification recovery zone 26 or the solvent. The water filter 22 (step four) is connected.

The washing tower solvent recovery device 8 described above, wherein the separation liquid of the washing liquid regeneration desorption zone 14 or the separation recovery zone 26 or the separated purification liquid 181 is refluxed to the washing liquid washing adsorption zone 13 A stirring zone or a filtration split 23 is provided for partial mixing or filtration and then refluxing to the washing liquid washing adsorption zone 13, and the oil is returned to the place where the oil is present.

In fact, it is possible to jump to step 3 in the first step, and the separating member 19 of the separating mechanism or material is disposed in the washing liquid washing adsorption zone 13 of the first step, as long as it is a filter type oil-water separation (the separation and purification zone shown in the second figure). Or washing the washing solvent of the washing zone 13 (separate water, washing liquid other than the organic solvent gas and for recovering the solvent) without directly condensing or distilling the rectifier 24 (referring to the separating member 19 itself) by the separating member 19 and The recovery of the organic solvent does not affect the operation of washing the adsorption zone 13 of the washing liquid, and directly goes to the purification recovery zone 26, and the same purpose can be achieved by the same reason. (as shown in the second picture)

In fact, if step 2 and/or step 3 are omitted, the recovery of solvent containing oil, substance or water is also considered as solvent recovery, and is also included in the patent scope. Please refer to the second, third and fourth figures. Show. (A washing tower type solvent recovery device as shown in the third figure, characterized in that a process windmill connected with a solvent gas is connected; a washing liquid washing adsorption zone 13 is connected to a washing solvent having more than one phase-dissociated liquid liquefied substance. The washing liquid for recovering the solvent; the washing liquid for washing the adsorption zone 13 with a washing liquid and the recovered solvent gas are recovered by the solvent molecule to produce a new mixed liquid. The fourth figure is the separation step 182 in the third step of the present invention. .)

* Please refer to the first to fourth diagrams for the solvent filter 22 to remove the solvent, or step 4: the solvent filter 22 is connected to the separated solvent to remove water or impurities or solvents other than the solvent.

The method for removing water in a solvent and removing water in an organic solvent, the common methods for dehydrating in an organic solvent are mainly divided into: Desiccant dehydration method; Membrane separation method for pervaporation gasification; Special rectifier 24 method: including extractive refiner distillation 24, azeotropic rectifier 24 method.

The above-mentioned inorganic porous membrane method for removing water vapor in the condensable gas and its permeation mechanism or coalescence device is well used by the pervaporation membrane device, and the dehydration by the adsorption porous membrane method is an organic hydrazine porous membrane method for removing trace water. The trace water in the organic germanium is removed and dehydrated by the loop solvent, recycled and reused, multi-cycle filtration and dehydration, and the pores of the membrane gel have a certain size, the bulky molecules can not penetrate into the pores and the solvent removes water, Further, the system uses vacuum filtration to degas, vacuum filtration with a 0.45 μm filter to remove bubbles in the solvent. We use the above method to remove water from the solvent or oil to 5 PPM.

*Please refer to the first to fourth figure 1 moisture meter 45 as the basis for judging whether the solvent water filter 22 is removed from the water vapor, or step 5: using the moisture meter 45 to determine the separation and purification zone 181 or the solvent filter Whether the water 22 is removed or not, the moisture meter 45, a measuring instrument for moisture content, of course, the moisture meter 45 has many principle modes for measuring, and can be connected with the device to control the operating program to predict the solvent filter. Whether the water 22 is removed from the water device is completed.

Example 2. (Example of separation zone)

The volatile organic compound VOC waste gas is fluidized by the fat 40 or the fatty acid ester 41 or the adsorbent material 30 into the washing liquid 11 for adsorption, and is combined with the high-efficiency washing tower to form the washing adsorption zone 13 of the scrubbing type solvent recovery device 8. The adsorption, the inlet gas has a pre-treatment device 9, the outlet gas treatment device 10 generates a clean gas discharge machine, and the part of the washing liquid 11 is sent to the liquid fluidization desorption bed of the washing liquid regeneration desorption zone 14 or The air source 15 blower 12 is desorbed, and the de-energized medium oil, substance or solvent is separated from the water separation section 17, and the high-concentration VOC grease is generated by the separating member 19 to enter the separation tank 18, thereby promoting the VOC grease due to the low-temperature condenser. 20, releasing a high concentration of VOC solvent, and then introducing the solvent into the solvent water filter 22 to remove water vapor in the solvent, because the washing liquid 11 used in the adsorption and desorption of the system of the present invention is used in a cyclotron cycle and has a stirring zone or filtration. The splitter 23 is partially mixed or filtered to be separated and then refluxed to the washing liquid washing adsorption zone 13, and the moisture meter 45 is used to judge whether the purified water or the solvent water filter 22 removes the water gas. And use the VOC characteristics of the exhaust gas produced to produce solvent recovery.

For example, the ratio of methanol VOC waste gas to fatty acid and fat is 1:1 to 3:1, and the nitrogen, liquid nitrogen, nitrogen compounds, nitrogen (gas) substances, oil and oil derived from the washing liquid adsorption material 30 are derived. Matter, fat, fat derivative, fatty acid, fatty acid derivative, fatty acid ester, citric acid, polyamine, diatomaceous earth, bone powder, zeolite, molecular sieve, activated carbon, tannin, activated alumina, porous adsorbent, resin Or the ratio of the liquefied porous adsorbent 30 and the water made by liquefying the porous resin or liquefying a part of the mixture to a ratio of 1 to 1, and adding an appropriate amount of a stabilizer and an emulsifier; Other substances, so that the solubility of the oil in the liquid adsorbent 30 can reach 30%, so the solvent and the solvent can be mixed to dissolve the adsorption amount of the solvent can reach 30% - 90%, and then converted to the separation tank 18, the condenser 20 The cooling crystallization temperature was -10 ° C, and the recovered solvent methanol separated by the method using fatty acid and fat as a raw material was a freezing point of 3 ° C.

Example 3. (Example of purification recovery zone)

The volatile organic compound VOC waste gas is fluidized by the fat 40 or the fatty acid ester 41 or the adsorbent material 30 into the washing liquid 11 for adsorption, and is combined with the high-efficiency washing tower to form the washing adsorption zone 13 of the scrubbing type solvent recovery device 8. The adsorption, the inlet gas has a pre-treatment device 9, and the outlet gas treatment device 10 generates a clean gas discharge machine, and some of the washing liquid 11 is directly sent to the purification recovery zone 26, and is directly sent to the low-temperature condenser 20 to release the high concentration. The VOC solvent is further introduced into the solvent water filter 22 to remove the water vapor in the solvent. The washing liquid 11 used for adsorption in the system of the present invention is used in a cyclotron cycle and has a stirring zone or a filtration split 23 for local mixing or filtration. After the splitting, it is refluxed to the washing liquid washing adsorption zone 13, and the moisture meter 45 is used to judge whether the solvent water filter 22 removes the safety mechanism of the completion of the water vapor, and the solvent recovery is generated by using the VOC characteristics of the discharged exhaust gas.

For example, the ratio of the amount of the VOC exhaust gas or the ratio of the fatty acid to the fat is 1:1 to 3:1, and the ratio of the liquefied porous adsorbent 30 made of the washing liquid adsorbing material 30 to water can be 1 to 1, or Add appropriate amount of stabilizer and emulsifier, etc.; you can also add a small amount of other substances, or make the oil in the liquid adsorbent 30 solubility up to 30%, so the oil and solvent can be mixed to dissolve the amount of solvent can reach 30% -- 90%, and then directly transferred to the condenser 20 through the above, the cooling crystallization temperature is -10 ° C, or the recovered solvent ethanol separated by the method using fatty acid and fat as a raw material is a freezing point of 3 ° C.

Example 4. (Example of separation and purification zone)

The volatile organic compound VOC waste gas is fluidized by the fat 40 or the fatty acid ester 41 or the adsorbent material 30 into the washing liquid 11 for adsorption, and is combined with the high-efficiency washing tower to form the washing adsorption zone 13 of the scrubbing type solvent recovery device 8. The adsorption, the inlet gas has a pre-treatment device 9, and the outlet gas treatment device 10 generates a clean gas discharge machine. As shown in the fifth figure, the washing liquid washing adsorption zone 13 and the washing liquid regeneration desorption zone 14 function can be alternately switched. In use, the gas switching valve 27 is used for separation and condensation, and the regenerative desorption zone 14 in the switching is decompressed, and the washing liquid is subjected to hot gas desorption, wherein the decompression degree and the hot gas desorption temperature may be determined according to the type of desorbing solvent gas. Therefore, at the same time, part of the concentrated solvent gas is directly sent to the low temperature condenser 20 to generate a high concentration liquid VOC solvent, and then This liquid solvent is introduced into the solvent storage tank to produce solvent recovery by producing VOC characteristics of the exhaust gas. For example, the amount of the isopropyl alcohol VOC exhaust gas or the ratio of the fatty acid ester 41 is 1:1 to 3:1, and the ratio of the liquefied porous adsorbent 30 made of the washing liquid adsorbing material 30 and the water can reach 1 to 1. , or add an appropriate amount of stabilizers and emulsifiers, etc.; a small amount of other substances may be added, or the solubility of the oil in the liquid adsorbent 30 may reach 30%, so that the fatty acid esters 41 and the solvent are mixed to dissolve the adsorbing amount of the solvent. It can reach 30%--90%, and the functions of the washing adsorption zone 13 and the washing liquid regeneration desorption zone 14 can be switched and operated alternately, and the regenerative desorption zone 14 in the switching is depressurized, and the washing liquid is taken off by hot gas. The pressure degree and the hot gas desorption temperature may be determined according to the type of the desorbing solvent gas, so that the partially concentrated solvent gas is directly transferred to the condenser 20, the cooling crystallization temperature is -10 ° C, or the fatty acid ester 41-- - The recovered solvent ethanol separated by this method is a freezing point of 3 °C.

By the above description, the advantages and achievable effects of the present invention can be summarized as follows:

1. The solvent recovery of the present invention does not require the use of a concentrated runner to cause secondary emission pollution and reduces operating costs, and the treatment efficiency of environmental emission standards is quite high, which can greatly enhance the industrial competitive advantage.

2. The solvent recovery, energy saving and carbon reduction and energy resource recovery of the present invention are trends of the times, and are suitable for volatile solvent (VOCs) treatment systems with high or low concentration and large or small air volume.

3. The solvent recovery of the invention does not require fire and enhances industrial safety.

4. The solvent recovery of the invention is simple, and the process is simple, and the traditional complicated high energy consumption process is broken.

5. The solvent recovery of the invention, the gas-to-liquid process, the phase change state and recovery, is applicable to various industries in various solvents, and has wide application range.

In summary, the present invention has excellent novelty, progress and practicability in the same kind of products, and at the same time, the technical materials of such system structures are frequently investigated at home and abroad, and the same special washing liquid is not found in the literature. The system configuration of the scrubbing type solvent recovery device exists first, so that the present invention already has the invention patent requirements, and the application is made according to law.

as above. The present invention has been described in its preferred embodiments, and is not intended to limit the scope of the present invention. The equivalents of the above-described technical contents may be modified or modified to equivalent variations without departing from the technical scope of the present invention, and the technical essence of the present invention is Any simple modifications, equivalent changes and modifications made by the embodiments are still within the scope of the technical solutions of the present invention.

In summary, the structural characteristics of the present invention improve the lack of solvent recovery in the conventional scrubbing tower, that is, increase the recovery efficiency of the purified solvent, and further obtain the effect of low energy consumption.

Description of the figure:

8‧‧‧washing tower solvent recovery unit

81‧‧‧Washing tower washing adsorption box

9‧‧‧Pre-processing device

10‧‧‧post processing unit

11‧‧‧ Washing liquid

12‧‧‧Blowers

121‧‧‧ windmill

13‧‧‧ Washing liquid washing adsorption zone

14‧‧‧ Washing fluid regeneration and desorption zone

15‧‧‧Desorbed gas source [or hot gas (or steam) source]

16‧‧‧ gas storage tank

161‧‧‧Isolated space

17‧‧‧ Oil, substance or solvent and water separation interval (oil, solvent, water separation interval)

18‧‧‧Separation tank

181‧‧‧Separation and purification zone

182‧‧‧Separation zone

19‧‧‧Separate components

20‧‧‧Condenser

21‧‧‧ liquid storage tank

22‧‧‧Solvent water filter

23‧‧‧Agitating or filtering the diverting zone

24‧‧‧Rectifier

25‧‧‧Nitrogen (or nitrogen compounds or nitrogen (gas) substances)

26‧‧‧Purification recovery area

27‧‧‧ gas switching valve

30‧‧‧Adsorbed material (or adsorbent)

40‧‧‧ fatty acids (or fat)

41‧‧‧Fatty acid esters

45‧‧‧Water meter

46‧‧‧Demulsification tester

The first figure is a schematic diagram of a solvent recovery device according to a preferred embodiment of the present invention (the same applies if there are multiple devices).

The first diagram is a schematic diagram of a solvent recovery apparatus of a preferred embodiment of the present invention.

The second figure is a schematic diagram of the solvent recovery device of the second embodiment of the present invention, which is omitted from the second step of the present invention (if there are multiple devices, the same is true).

The second diagram is a schematic diagram of the present invention containing a plurality of devices, and the second step is omitted to purify the recovery zone.

The third figure is a schematic diagram of the solvent recovery device of another specific embodiment 1 which is omitted in the second step and the third step of the present invention (the same can be proved if there are multiple devices).

The fourth figure is a schematic diagram of the solvent recovery device according to another specific embodiment of the separation zone, which is omitted in the third step of the present invention (the same can be proved if there are multiple devices).

The fifth figure is a schematic diagram of the washing liquid adsorption adsorption zone and the washing liquid regeneration desorption zone function of the present invention, which can be used in an alternate phase switching operation using a solvent recovery device of a specific embodiment (the same can be proved if there are multiple devices).

Claims (10)

A scrubbing type solvent recovery device comprising: a process windmill connected to recover a solvent gas, a scrubbing tower washing adsorber, and a separation tank and a post-treatment condenser, wherein the washing tower washing The adsorber system comprises at least one washing tower type washing adsorption box block device, and further comprises: an isolation space and the washing tower type washing adsorption box block, wherein the isolation space is used for separating the washing tower type washing adsorption box The washing liquid in the block washes the adsorption zone and the washing liquid regeneration desorption zone. The washing tower type washing adsorption block is a washing liquid containing the inlet and outlet gas to wash the adsorption zone and is connected to a washing liquid regeneration desorption zone; a washing liquid adsorption The material is disposed in the washing tower type adsorption adsorption box of the washing tower type washing adsorber, comprising water and at least one selected from the group consisting of: emulsifier, nitrogen, liquid nitrogen, nitrogen compound, and nitrogen (gas) substances, inert gases, inert gas substances, oils, oil derivatives, fats, fat derivatives, fatty acids, fatty acid derivatives, fatty acid esters, citric acid, polyfluorene , diatomaceous earth, bone powder, zeolite, molecular sieve, activated carbon, tannin, activated alumina, porous adsorbent, resin, porous resin, some of which are liquefied or have a liquid phase which produces phase-change separation. a liquefied adsorbent; a separation tank for receiving a desorption substance capable of generating a phase change separation, the substance is derived from the washing liquid washing adsorption zone and the washing liquid regeneration desorption zone; a condenser, The separation tank is connected to condense the phase metamorphic substance and the solvent in the separation tank; the washing liquid washing adsorption zone device is an eddy current processing device, and the washing liquid flows to the washing liquid regeneration desorption zone device, and the washing is performed after desorption The liquid is refluxed to the wash liquid to wash the adsorption zone. A scrubbing type solvent recovery device is characterized in that a process windmill device is connected to recover a solvent gas; a washing liquid washing adsorption zone device is connected to the washing liquid adsorption material according to claim 1 of the patent scope, and the washing liquid is connected with the recovered solvent gas. The solvent mixture is recovered and recovered to produce a new mixed liquid; the washing liquid regeneration desorption zone device is a separating member, and comprises a water-dissolving non-water-soluble separating member in the regenerated desorbing member, which is a separating member of a phase change substance and a solvent. The washing tower solvent recovery device according to the first or the second aspect of the invention, wherein the washing liquid washing adsorption zone further comprises: an air inlet pre-filtering gas treatment device, and the washing liquid washing adsorption zone connection. The washing tower solvent recovery device according to claim 1 or 2, wherein the washing liquid washing adsorption zone further comprises: a gas filtering device disposed after the exhaust port, and the washing liquid washing adsorption zone is connected . The washing tower solvent recovery device according to the first or the second aspect of the invention, wherein the desorption device of the washing liquid regeneration desorption zone is an oil-water separation device, wherein the oil-water separation device is selected from the group consisting of: Reverse osmosis, scraping, roller, filter, gravity floating, tilting Separation type, separation type, separation type, viscosity separation type, decompression separation type, density difference separation type, medium separation type, separation principle of separation flow principle, separation type of turbulent boundary layer principle, liquid level difference separation type, Heating at least one of the separation type or the ultrasonic separation type. The washing tower solvent recovery device according to claim 1 or 2, wherein the washing liquid regeneration desorption zone further comprises a gas storage tank when the air blower is desorbed; and the washing liquid is regenerated The zone desorption gas source is selected from at least one of the following: steam, nitrogen, solvent gas, oil and gas, carbon dioxide, air, hot air, cold air or a mixture thereof. The washing tower solvent recovery device according to claim 1 or 2, further comprising a demulsifying degree measuring instrument as a judgment as to whether the washing liquid wash adsorption zone enters the washing liquid regeneration desorption zone The basis for completion. The scrubbing type solvent recovery apparatus according to claim 1 or 2, further comprising a solvent water filter as a substance other than the solvent. The washing tower type solvent recovery device according to claim 1 or 2, further comprising a moisture meter as a basis for judging whether or not the water gas is removed after the solvent is purified. A washing tower solvent recovery method, which is a device according to any one of claims 1 to 9, which comprises the first step: the organic substance is washed and adsorbed by the liquefied adsorbent in the washing liquid washing adsorption zone; Step 2: the washing liquid adsorbing material in the regeneration and desorption zone of the washing liquid is desorbed by the separating member, and the main substance of the desorption is degraded material and solvent; Step 3: after the device is absorbed and desorbed, the separated material is combined to achieve phase transformation state separation. It is necessary to add a temperature change treatment device to recover the organic solvent.